MONOLITHIC POWER SYSTEMS, INC.

MPWR
Exchange
Nasdaq
Industry
Semiconductors & Related Devices
SEC CIK
0001280452

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateInsiderTransactionSharesAvg priceValueShares afterHolding changeFiling
Aug 26, 20267:22 PM ETAug 24, 2026DEAN ROBERT W IIInterim CFOSSaleCommon Stock−32$1,297.72−$41.53K7.09K−0.4%SEC
Aug 25, 20267:13 PM ETAug 24, 2026CHANG KUO WEI HERBERTDirectorSSaleCommon Stock−50$1,281.57−$64.08K515−8.8%SEC
Aug 19, 20268:44 PM ETAug 17, 2026DEAN ROBERT W IIInterim CFOSSaleCommon Stock−6$1,413.64−$8.48K7.13K−0.1%SEC
Aug 13, 20265:23 PM ETAug 11, 2026CHANG KUO WEI HERBERTDirectorSSaleCommon Stock−50$1,420.00−$71K565−8.1%SEC
Aug 6, 20266:20 PM ETAug 5, 2026DEAN ROBERT W IIInterim CFOSSaleCommon Stock−105$1,344.27−$141.15K7.13K−1.5%SEC
Aug 5, 20265:33 PM ETAug 3, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−30$1,343.94−$40.32K1.12K−2.6%SEC10b5-1
Jul 17, 20265:43 PM ETJul 15, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−15K$1,349.7291−$20.25M151.64K−9.0%SEC10b5-1
Jul 6, 20265:51 PM ETJul 1, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−30$1,351.61−$40.55K1.15K−2.5%SEC10b5-1
Jun 3, 2026Jun 1, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−30$1,533.95−$46.02K1.18K−2.5%SEC10b5-1
May 29, 2026May 27, 2026Tseng SariaEVP & General CounselSSaleCommon Stock−7.57K$1,700.00−$12.86M144.22K−5.0%SEC
May 28, 2026May 26, 2026DEAN ROBERT W IIInterim CFOSSaleCommon Stock−22$1,649.56−$36.29K5.88K−0.4%SEC
May 27, 2026May 26, 2026Zhou JeffDirectorSSaleCommon Stock−486$1,680.00−$816.48K3.8K−11.3%SEC
May 27, 2026May 22, 2026Tseng SariaEVP & General CounselSSaleCommon Stock−5K$1,586.43−$7.93M151.78K−3.2%SEC
May 20, 2026May 18, 2026Hsing MichaelCEOSSaleCommon Stock−40K$1,482.7542−$59.31M848.26K−4.5%SEC
May 20, 2026May 18, 2026DEAN ROBERT W IIInterim CFOSSaleCommon Stock−4$1,563.28−$6.25K5.9K−0.1%SEC
May 19, 2026May 15, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−12K$1,561.4041−$18.74M166.64K−6.7%SEC10b5-1
May 8, 2026May 6, 2026Elmiger Eugen JDirectorSSaleCommon Stock−12K$1,584.9568−$19.02M5.4K−69.0%SEC
May 8, 2026May 6, 2026Xiao DemingEVP, Global OperationsSSaleCommon Stock−30K$1,654.552−$49.64M205.96K−12.7%SEC
May 8, 2026May 6, 2026Wynne EileenDirectorSSaleCommon Stock−335$1,582.68−$530.2K1.01K−25.0%SEC
May 6, 2026May 5 – May 6, 2026Zhou JeffDirectorSSaleCommon Stock−1.51K$1,607.8486−$2.43M4.29K−26.1%SEC
May 6, 2026May 5, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−380$1,583.81−$601.85K919−29.3%SEC
May 6, 2026May 4, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−30$1,588.73−$47.66K1.21K−2.4%SEC10b5-1
Apr 10, 2026Apr 8, 2026Tseng SariaEVP & General CounselSSaleCommon Stock−8.96K$1,305.2164−$11.7M156.98K−5.4%SEC10b5-1
Apr 8, 2026Apr 6, 2026Tseng SariaEVP & General CounselSSaleCommon Stock−7.64K$1,167.9458−$8.92M165.95K−4.4%SEC10b5-1
Apr 3, 2026Apr 1, 2026Tseng SariaEVP & General CounselSSaleCommon Stock−1.4K$1,133.5174−$1.59M173.58K−0.8%SEC10b5-1
Apr 3, 2026Apr 1, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−30$1,116.44−$33.49K1.24K−2.4%SEC10b5-1
Apr 1, 2026Mar 30, 2026Tseng SariaEVP & General CounselSSaleCommon Stock−25.67K$1,010.5024−$25.94M174.98K−12.8%SEC10b5-1
Mar 24, 2026Mar 20, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−30$1,095.07−$32.85K1.27K−2.3%SEC10b5-1
Feb 17, 2026Feb 12, 2026Hsing MichaelCEOSSaleCommon Stock−33K$1,171.826−$38.67M888.23K−3.6%SEC10b5-1
Feb 13, 2026Feb 11, 2026Hsing MichaelCEOSSaleCommon Stock−33K$1,188.9155−$39.23M921.23K−3.5%SEC10b5-1
Feb 12, 2026Feb 11, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−200$1,179.98−$236K1.3K−13.3%SEC
Feb 12, 2026Feb 10, 2026Hsing MichaelCEOSSaleCommon Stock−34K$1,142.2775−$38.84M954.23K−3.4%SEC10b5-1
Feb 11, 2026Feb 9, 2026Lee Victor KDirectorSSaleCommon Stock−400$1,212.16−$484.86K27.76K−1.4%SEC10b5-1
Feb 10, 2026Feb 6, 2026Xiao DemingEVP, Global OperationsSSaleCommon Stock−22.88K$1,171.16−$26.79M235.93K−8.8%SEC
Feb 10, 2026Feb 6, 2026Tseng SariaEVP & General CounselSSaleCommon Stock−22.88K$1,171.16−$26.79M200.63K−10.2%SEC
Feb 10, 2026Feb 6, 2026Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−22.88K$1,171.16−$26.79M178.63K−11.4%SEC
Feb 10, 2026Feb 6, 2026BLEGEN THEODOREEVP and CFOSSaleCommon Stock−21.73K$1,171.16−$25.44M82.35K−20.9%SEC
Feb 10, 2026Feb 6, 2026Hsing MichaelCEOSSaleCommon Stock−54.92K$1,171.16−$64.32M988.23K−5.3%SEC
Feb 4, 2026Feb 2, 2026BLEGEN THEODOREEVP and CFOSSaleCommon Stock−3K$1,129.7554−$3.39M65.33K−4.4%SEC10b5-1
Jan 6, 2026Jan 2, 2026Lee Victor KDirectorSSaleCommon Stock−600$930.86−$558.52K27.97K−2.1%SEC10b5-1
Jan 6, 2026Jan 2, 2026BLEGEN THEODOREEVP and CFOSSaleCommon Stock−3K$940.4665−$2.82M68.33K−4.2%SEC10b5-1
Dec 29, 2025Dec 24, 2025Lee Victor KDirectorSSaleCommon Stock−1K$951.7192−$951.72K28.57K−3.4%SEC10b5-1
Dec 2, 2025Dec 1, 2025BLEGEN THEODOREEVP and CFOSSaleCommon Stock−3K$908.2078−$2.72M71.33K−4.0%SEC10b5-1
Nov 28, 2025Nov 26, 2025Tseng SariaEVP & General CounselSSaleCommon Stock−20K$926.4658−$18.53M167.33K−10.7%SEC
Nov 28, 2025Nov 25, 2025Tseng SariaEVP & General CounselSSaleCommon Stock−20K$904.1819−$18.08M187.33K−9.6%SEC
Nov 25, 2025Nov 25, 2025CHANG KUO WEI HERBERTDirectorSSaleCommon Stock−100$896.97−$89.7K426−19.0%SEC
Nov 25, 2025Nov 24, 2025Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−3.98K$895.23−$3.56M144.33K−2.7%SEC
Nov 24, 2025Nov 21, 2025CHANG KUO WEI HERBERTDirectorSSaleCommon Stock−100$873.97−$87.4K526−16.0%SEC
Nov 20, 2025Nov 19, 2025Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−27.97K$881.6558−$24.66M148.31K−15.9%SEC
Nov 20, 2025Nov 19, 2025Sciammas MauriceEVP, WW Sales & MarketingSSaleCommon Stock−7.03K$870.2103−$6.12M176.27K−3.8%SEC